//如何引入一个模块，取决于该模块是如何暴露的
import {sum,sub,a1 as w1} from './module1';
import {xuexiao,xiaoxi} from './module2'
import qwertyu from './module3'
import obj,{a1,a2,a3,b1,b2,b3} from './module4'

console.log(sum(1,2));
console.log(sub(4,3));
console.log(xuexiao)
console.log(xiaoxi)
console.log(qwertyu)
console.log(obj)
obj.c3()
console.log(a1,a2,a3,b1,b2,b3)
console.log(w1(1,2,3))
